LibriVox - free public domain audiobooks
AudioBookBinder - Got a lot of audiobooks in MP3 format and would like to listen them on your iPod?
OverDrive Media Console - Download eBooks and audiobooks from your library directly to your iPhone, iPad, and iPod Touch!
Listen to books for free - Listen to books for free is an app by Anyreads that allows users to listen to up to 7000 audiobooks right on their mobile phones.
Listen Audiobook Player - Feature rich and easy to use player for your audio books.
Audiobook Builder - Audiobook Builder is a software that enables users to turn their audio files into audiobooks which they can sue then on their iPhone, iPad, or any other Apple devices.